I just had mine replaced (hit by a rock in Telluride), the first glass they brought was all scratched. So they had to order a new one from BMW. I think this might be a problem in the packing when they ship the glass.
On another note the installer told me it is the thinnest glass he has ever replaced.

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"It's a family thing"
2007 e70 X5 4.8- Wife's
2003 e39 M5- Mine
1995 e36 M3- Track Car
2004 e46 M3- Mom's
2006 e60 M5- Dad's